title: PCBs in Central Vietnam coastal lagoons: levels and trends in dynamic environments.
abstract: PCBs were analysed in surficial sediments and selected sediment cores collected between 2002 and 2008 in Central Vietnam coastal lagoons. The aim was to determine contamination levels and trends, and to evaluate the effects of anthropogenic pressures and natural events. Samples were mostly fine-grained with low total PCB concentrations (0.367-44.7 μg kg(-1)). Atmospheric transport and post depositional processes modify to some degree the fingerprint of PCB inputs to the environment favouring the predominance of 3, 4 and 5 chlorinated congeners. The similarity of congener distributions in contemporary surficial samples also suggests the presence of a unique source over the entire study area, probably connected to mobilisation and long range transports from land-based stocks. The removal of consistent sediment layers is hypothesised based on repeated samplings of the same area. Natural meteorological events (such as typhoons) are suspected to be responsible for these sediment losses.
authors.affiliation: CNR-Istituto di Scienze Marine, Via Gobetti 101, 40129 Bologna, Italy. silvia.giuliani@bo.ismar.cnr.it
authors.forename: Silvia
authors.initials: S
authors.lastname: Giuliani
authors.forename: Rossano
authors.initials: R
authors.lastname: Piazza
authors.forename: Luca Giorgio
authors.initials: LG
authors.lastname: Bellucci
authors.forename: Nguyen Huu
authors.initials: NH
authors.lastname: Cu
authors.forename: Marco
authors.initials: M
authors.lastname: Vecchiato
authors.forename: Stefania
authors.initials: S
authors.lastname: Romano
authors.forename: Cristian
authors.initials: C
authors.lastname: Mugnai
authors.forename: Dang Hoai
authors.initials: DH
authors.lastname: Nhon
authors.forename: Mauro
authors.initials: M
authors.lastname: Frignani
mesh_terms: D001272:Atmosphere / Q000737:chemistry; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D016062:Porosity; D012623:Seawater / Q000737:chemistry*; D014744:Vietnam; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014877:Water Pollution, Chemical / Q000706:statistics & numerical data
chemical_list: D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls